Two displays can work with these video drivers:
video = gma(F)
video = i915(F)
video = nouveau(F)
video = radeon(F)
video = ati(U)
video = intel(U)
video = nouveau(U)
With other video= values second display won't work. And with VESA also it won't work.
This feature can work only if terminal video card has two or more video outputs. Two video cards in one computer are not supported now.
Second display is turned on by M2_display parameter. For example:
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video=i915(f)
display=1280x1024,VGA
M2_display=1366x768,DVI
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[KERNEL] [drm] Radeon Display Connectors
[KERNEL] [drm] Connector 0:
[KERNEL] [drm] HDMI-A-1
[KERNEL] [drm] HPD1
[KERNEL] [drm] DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 0x643c
[KERNEL] [drm] Encoders:
[KERNEL] [drm] DFP1: INTERNAL_UNIPHY
[KERNEL] [drm] Connector 1:
[KERNEL] [drm] HDMI-A-2
[KERNEL] [drm] HPD2
[KERNEL] [drm] DDC: 0x6440 0x6440 0x6444 0x6444 0x6448 0x6448 0x644c 0x644c
[KERNEL] [drm] Encoders:
[KERNEL] [drm] DFP2: INTERNAL_UNIPHY
[KERNEL] [drm] Connector 2:
[KERNEL] [drm] VGA-1
[KERNEL] [drm] DDC: 0x64d8 0x64d8 0x64dc 0x64dc 0x64e0 0x64e0 0x64e4 0x64e4
[KERNEL] [drm] Encoders:
[KERNEL] [drm] CRT1: INTERNAL_KLDSCP_DAC1
Relative position of two displays is specified by M2_position parameter:
M2_position = right-bottom
Which means that second display is positioned to the right of the first monitor, and they are bottom aligned. Bottom or top alignment is significant if resolutions are not the same. If resolutions are equal, then values =right, =right-top and =right-bottom will give the same result.
Second display can work in two modes:
1. One RDP session on two displays. The same as mstsc.exe does. For this mode no special parameters except M2_display= and M2_position= are needed on configuration file. Terminal finds instruction to use second display, sees no individual sessions for second display and automatically tries to stretch session on two displays. Of course if terminal server supports this feature - 2008R2 supports two displays, 2003 doesn't.
2. Individual virtual screens and connections on each display. Just the same as on one display, separate list. Starts from magic word:
M2_next screen
The everything is the same as for the first display. Each next virtual screen starts from the word M2_next screen. Example of configuration file with menu with two items on the first display and another menu with three items on the second display:
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video=i915(f)
display=1280x1024,VGA
M2_display=1366x768,DVI
connection c1
connection c2
M2_next screen
connection c2
connection c3
connection c4
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video=i915(f)
display=1280x1024,VGA
M2_display=1366x768,DVI
connection c1
next screen
connection c2
M2_next screen
connection c2
connection c3
connection c4
M2_next screen
connection c5
connection c6
connection c7